function rolltd(object,roll) {
        if (object.className.indexOf('selected')==-1) {
            var class_name= object.className.split(' ');
            object.className= roll==1 ? class_name[0]+' over' : class_name[0];
        }
    }
    
    var img_folder= '/img_wbtr/';
    function change_world_part(object,to) {
        //var class_name= object.className.split(' ');
        var wpart_this= document.getElementById('wpart_this');
        if (wpart_this.value!=to) {
            var img_to= document.getElementById('img_'+to);
            var img_this= document.getElementById('img_'+wpart_this.value);
            
            var match_to= /\/([a-z]+)\_[a-z]{2,3}\.[a-z]{3}$/i.exec(img_to.src);
            img_to.src= img_folder + match_to[1] + '_on.gif';
            var match_this= /\/([a-z]+)\_[a-z]{2,3}\.[a-z]{3}$/i.exec(img_this.src);
            img_this.src= img_folder + match_this[1] + '_out.gif';
            
            //document.getElementById('td_'+wpart_this.value).className= class_name[0];
            //object.className= class_name[0]+' selected';
            document.getElementById('map_'+wpart_this.value).style.display= 'none';
            document.getElementById('map_'+to).style.display= '';
            wpart_this.value= to;
        }
        return false;
    }